摘要
基于地球物理、测井资料设计构造砂箱变形模拟实验,再结合断层相关褶皱理论来研究龙门山南段前缘地区构造变形特征。单层硅胶层与无硅胶层实验模型对比表明单层硅胶层模型更吻合实际的地震剖面,硅胶层的存在使深部构造保存得更为完整,变形强度要弱于无硅胶层实验。通过实验结果,更为精准地解释了地震剖面,从地震剖面可以看出,从造山带向盆地横向上构造活动减弱;在盆地内,中三叠统雷口坡组厚层膏盐岩作为滑脱层,吸收了大量应力,影响了纵向上的构造变形,滑脱层之上的构造变形强于其之下的地层:褶皱隆起的幅度更强,断层更为发育但较难突破滑脱层向下发展。实验证明在滑脱层中,应力无法传播很远,断层只能被局限在一定的范围内发展。研究结果对于研究区变形特征以及深层构造特征研究有重要意义,对于该区深层特别是滑脱层之下油气勘探有一定的借鉴意义。
In order to study structural features in front area of southern section of Longmen mountain,geophysical and drilling data was used to design sandbox structural deformation experiments.After the comparisons with two models(with single silica gel layer or not),the results show that the sandbox model which with single silica gel layer is highly similar to seismic profile in study area,the existence of silica gel layer is propitious to maintain deep structures,deformation strength of structures is weaker than no silica gel layer sandbox experiment.Through the results we have accurate interpretation of seismic profile,from seismic profile we can see structural movements weaken gradually from orogenic belt to basin(in horizontal direction)in this area;But inside basin,thick gypsum salt rocks of the Middle Triassic Leikoupo Fm,as a set of detachment layer,absorbing a large amount of stress and affecting vertical structural deformation.The structural deformation which above detachment layer is stronger than that under the detachment layer:the uplift amplitude of folds is stronger,faults develop more easily,but they hardly pass through detachment layer.At the same time,experimental results show that stress cannot propagate far away in detachment layer,faults develop in limited range.These results may have great significant on research for surface and deep structural deformation features in study area,and it can be a reference in deep oil and gas exploration in deep strata especially under the detachment layer.
作者
袁月
孙玮
刘树根
李泽奇
邓宾
黄瑞
常雨琪
YUAN Yue;SUN Wei;LIU Shu-gen;LI Ze-qi;DENG Bin;HUANG Rui;CHANG Yu-qi(State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation;Key Laboratory for Structural Mineralization and Accumulation of the Ministry of Land and Resources)
出处
《科学技术与工程》
北大核心
2018年第19期9-19,共11页
Science Technology and Engineering
基金
中石化前导性项目(P16109)
"十三五"国家重大专项(2017ZX05005003-007)资助
关键词
龙门山南段前缘
膏盐岩
滑脱层
砂箱实验
front area of the southern section of Longmen mountain
gypsum salt rock
detachment layer sandbox experiment
